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1987BAAS...19..730A - Bull. American Astron. Soc., 19, 730 (1987)
Two compact planetary nebulae of moderate excitation, NGC 6565 (3-4.5) and NGC 6644 (8-7.2).
ALLER L.H., KEYES C.D. and FEIBELMAN W.A.
Journal keyword(s):
Simbad objects: 2
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